Commands by manny79

Commands by manny79 (2)

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Generate SHA1 hash for each file in a list

Alternative command for performing an sha1 hash for a given set of files matched by a wildcard Show Sample Output
This is sample output - yours may be different.
```
4cda65fe07b185f034dd877e0837942fb032eeff  cg_cuda.cu
060f137380cfd715dc038fe2486157773d893ab2  ConjugateGradient.h
b7d927e6fd78da5ac93e924824b17f25e1a93ecd  cudasolver.cpp
a736dcc1a4a8f168000951efea0f1028d6938940  cudasolver.h
e7fc11230d14bac882ccd1d14c72c79890b650cf  cuda_support.h
```
-2

sha1sum * >> SHA1SUMS

manny79 · 2010-05-05 18:14:52 2
Show GCC-generated optimization commands when using the "-march=native" or "-mtune=native" switches for compilation.

You can tell GCC to automatically select optimization commands and produce optimized code for the local machine (the one compiling the code), but you can't normally see what switches have been selected and used unless you append a "-v" and pause compilation. Show Sample Output
This is sample output - yours may be different.
```
This is the output on my AMD Athlon64 X2:

/usr/lib/gcc/i486-linux-gnu/4.3.3/cc1 -E -quiet -v - -D_FORTIFY_SOURCE=2 -march=k8-sse3 -mcx16 -msahf --param l1-cache-size=64 --param l1-cache-line-size=64 -mtune=k8
```
5

cc -march=native -E -v - </dev/null 2>&1 | grep cc1

manny79 · 2009-08-21 09:47:37 9

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kill process by name

Or even easier, if it's available: $ killall firefox I have no idea why you would want to rely on two unusual dependencies to do something that can be done a hundred ways from coreutils...

Kill all processes belonging to a user

Get your Firefox bookmarks

Extracts yours bookmarks out of sqlite with the format: dateAdded|url

Show me a histogram of the busiest minutes in a log file:

Busiest seconds: $ cat /var/log/secure.log | awk '{print substr($0,0,15)}' | uniq -c | sort -nr | awk '{printf("\n%s ",$0) ; for (i = 0; i

List programs with open ports and connections

I prefer to use this and not the -n variety, so I get DNS-resolved hostnames. Nice when I'm trying to figure out who's got that port open.

Change the primary group of a user

Rename files in batch

List latest 5 modified files recursively

The output format is given by the -printf parameter: %T@ = modify time in seconds since Jan. 1, 1970, 00:00 GMT, with fractional part. Mandatory, hidden in the end. %TY-%Tm-%Td %TH:%TM:%.2TS = modify time as YYYY-MM-DD HH:MM:SS. Optional. %p = file path Refer to http://linux.die.net/man/1/find for more about -printf formatting. ------------------------ sort -nr = sort numerically and reverse (higher values - most recent timestamp - first) head -n 5 = get only 5 first lines (change 5 to whatever you want) cut -f2- -d" " = trim first field (timestamp, used only for sorting) ------------------------ Very useful for building scripts for detecting malicious files upload and malware injections.

check open ports without netstat or lsof

Create QR codes from a URL.

QR codes are those funny square 2d bar codes that everyone seems to be pointing their smart phones at. Try the following... $ qrurl http://xkcd.com Then open qr.*.png in your favorite image viewer. Point your the bar code reader on your smart phone at the code, and you'll shortly be reading xkcd on your phone. URLs are not the only thing that can be encoded by QR codes... short texts (to around 2K) can be encoded this way, although this function doesn't do any URL encoding, so unless you want to do that by hand it won't be useful for that.

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